Resonance Lineshapes in Optical Cavity

Seokchan Yoon, René Reimann, S. Manz +4 more

Summary form only given. We observe the quantized motion of single atoms strongly coupled to a high-finesse optical cavity and investigate dynamics of cavity-assisted atom cooling. Single caesium atoms are trapped in a blue-detuned standing-wave intracavity dipole trap, formed by a lock laser which is used to stabilize the cavity resonance frequency. A probe laser is coupled into the cavity mode and its transmission spectrum is monitored by means of photon-counting heterodyne spectroscopy [2].Measured heterodyne spectra of single atoms in the cavity are shown in Fig. 1 for two different lock-laser intensities and compared with theoretical models. The motional Raman sidebands are offset from the carrier beat signal at 1 MHz by the atomic vibrational frequency (±ν). They show asymmetric lineshapes due to the anharmonicity of the dipole potential.We investigate the dependence of the positions and lineshapes of the motional Raman sidebands on experimantal parameters such as the cavity-atom detuning, and lock-laser intensity. Information on the atomic temperature, cooling and heating rates, as well as the atomic position in the cavity with respect to an antinode of the cavity probe field are found by comparing the observed spectra with theoretical predictions [1]. In addition, this technique can also be used to analyze the cooling dynamics of a cavity-assisted EIT cooling scheme which has been recently studied and demonstrated in [3,4].

P. A. Hackett, R. A. Back

J.A. Hermann, S. Swain

Yameng Xu, Jiaxuan Li, Mei Kong

Abstract To accommodate different application requirements, resonances of microring resonator (MRR)-based devices have been developed into various lineshapes, such as electromagnetically induced transparency, electromagnetically induced absorption, and Fano lineshapes. However, these lineshapes are mainly achieved in large-footprint structures demanding precise control. Under such context, this work investigates the formation of various resonance lineshapes in a single MRR with two partially reflecting elements incorporated into the bus waveguide. The transfer matrix model of the compact structure is established with the reflective wave in the MRR included. It is revealed that the abundant resonance lineshapes originate from the mode-coupling between the Fabry–Perot cavity and the MRR. Based on this model, the formation of each resonance lineshape is analyzed. The conditions under which each resonance lineshape can occur are identified and the characteristics of these resonance lineshapes are studied. In addition, the significant role of the reflective wave in the formation of these lineshapes is emphasized. Under the theoretical guidance of the presented work, various resonance lineshapes can be achieved and designed flexibly in a single MRR. Thus, the lineshapes required for a range of applications can be realized in a simple and reproducible MRR.

Vladilen S Letokhov, Veniamin P. Chebotayev

Xiaodong Yang, Mingbin Yu, Dim‐Lee Kwong +1 more

We present experimental and theoretical studies of coupled resonances in multiple silicon photonic crystal cavities in an all-optical classical analogy to electromagnetically induced transparency. Multiple implementation schemes are demonstrated, such as two (in various configurations), and four cavities. The photonic crystal cavities are embedded in 2-D photonic crystal slabs and designed in the overcoupled regime. Our observations include measured transparency resonance lifetimes more than three times the single-cavity lifetimes, Fano-like lineshapes, and stepwise resonance control through multiple aligned external optical pump beams. All observed schemes are analyzed rigorously through finite-difference time-domain simulations and the coupled-mode formalism. Our experimental and theoretical results are applicable to optical pulse trapping and all-optical dynamical storage of light in the solid state.